Use of fluorescence excitation-emission matrices coupled with parallel factor analysis to monitor C- and N-DBPs formation in drinking water recovered from cyanobacteria-laden sludge dewatering
Autor: | Haiyan Pei, Lin Zhang, Hangzhou Xu, Yan Jin, Chunxia Ma |
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Rok vydání: | 2018 |
Předmět: |
Cyanobacteria
Environmental Engineering Aluminium chloride Lysis Halogenation 0208 environmental biotechnology 02 engineering and technology 010501 environmental sciences 01 natural sciences Chloride Waste Disposal Fluid Water Purification Chitosan chemistry.chemical_compound medicine Environmental Chemistry Organic matter Waste Management and Disposal 0105 earth and related environmental sciences chemistry.chemical_classification biology Sewage Chemistry Drinking Water biology.organism_classification Pollution Dewatering Fluorescence 020801 environmental engineering Disinfection Environmental chemistry Factor Analysis Statistical Water Pollutants Chemical medicine.drug Disinfectants |
Zdroj: | The Science of the total environment. |
ISSN: | 1879-1026 |
Popis: | This is the first time that correlations between the spectroscopic properties of algal organic matter (AOM) and cyanobacteria-related C- and N-disinfection byproduct (DBP) formation have been presented. Three types of coagulants, aluminium chloride (AC), chitosan (CTS) and a composite chitosan-aluminium chloride (CTSAC), were selected to assess and compare the performance of coagulation to control DBPs formation in dewatering water (DW). Fluorescence excitation–emission matrices (EEMs) coupled with parallel factor analysis (PARAFAC) indicated that four components dominated the EEM of the DW samples. Examination of C-, N-DPBs formation and attendant changes in the AOM parameters allows the establishment of strong linear relationships between yields of the trihalomethanes, haloacetonitriles and trichloronitromethane and the relative changes in the fluorescence compounds. Stronger linear correlations were found between trihalomethanes and tryptophan-like substance C1 (r = 0.918), between haloacetonitriles and C1 (r = 0.934), and between trichloronitromethane and amino acid-like substance C2 (r = 0.915) than other AOM parameters, suggesting that tryptophan-like substance and amino acid-like substance in AOM play major roles in generating cyanobacteria-related DBPs upon chlorination. Furthermore, because the CTSAC composite was effective in removing fluorophores and caused little cell lysis during the first 4 days of sludge storage, the production of C-, N-DBPs in the DW was lower than those in the AC or CTS systems for the same storage period. This indicates the feasibility of surrogate monitoring of the production of cyanobacteria-related C-, N-DBPs via online measurements of water EEM fluorescence. CTSAC composite coagulant is thus recommended, and the sludge should be disposed of within 4 days to obtain DW with lower DBPs formation potentials. |
Databáze: | OpenAIRE |
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